1,720,992 research outputs found
Esame della fascia costiera Adriatica (settore italiano). Studio di dettaglio sulle aree che presentano le condizioni migliori per avviare lo studio avanzato sulla fattibilità del “sand engineering”. FASE 2
No full textConvenzione di ricerca tra Eni s.p.a. e il Dipartimento di Fisica e Scienze della Terra dell'Università di Ferrara (responsabile scientifico prof. Paolo Ciavola) - Le ben note problematiche legate ai processi di erosione costiera mantengono alta l’attenzione sulle aree litorali, spesso investite da fenomeni di arretramento della linea di riva. Molteplici sono gli interventi adottati per ridurne l’impatto negativo, ma non sempre l’esito è risultato essere quello atteso o, altrimenti, un mero palliativo. Per questo motivo ultimamente è stata concepita l’idea di realizzare sulla costa emiliano-romagnola un ripascimento artificiale caratterizzato da quantitativi di sabbia molto maggiori rispetto a quelli effettuati sinora, secondo caso in Europa dopo quello sulla costa olandese: il cosiddetto Sand Engine. Dopo un primo studio di fattibilità volto alla selezione dei siti idonei all’attuazione del progetto, il presente lavoro è finalizzato a produrre una piena caratterizzazione delle dinamiche sedimentarie e morfologiche dei due tratti di litorale scelti come potenziali Sand Motors, ovvero Lido di Spina – Bellocchio a nord e Lido di Dante – Lido di Classe a sud. Report finale
Assessing the use of a camera system within an autonomous underwater vehicle for monitoring the distribution and density of sea scallops (Placopecten magellanicus) in the Mid-Atlantic Bight
No full textPublisher's PDFThe sea scallop (Placopecten
magellanicus) fishery in the
Atlantic is assessed during annual
surveys by using both dredging
and surface-deployed imaging techniques.
In this pilot study in the
Mid-Atlantic Bight, we used an autonomous
underwater vehicle (AUV)
to photograph the seafloor and to
evaluate its use for determining
scallop density and size. During 22
surveys in 2011, 257 km of seafloor
were photographed, resulting in over
203,000 color images. Using trained
annotators and photogrammetric
software, we determined scallop
density and shell heights for 15,252
scallops. The inshore scallop grounds
near Long Island (at depths <40 m)
had a density of 0.077 scallops per
m2, whereas the inshore grounds
of the New York Bight had a density
of 0.012 scallops per m2. Shell
heights derived from images were
found to agree well with measurements
from scallops collected with
a commercial dredge. We show that
images obtained with an AUV can be
used to reliably estimate both density
and shell height consistent with
direct sampling from the same area.
Moreover, side-scan sonar images
obtained with an AUV can be used
to detect dredge scars and, therefore,
can provide a simultaneous,
relative estimate of fishing effort in
that area. AUVs provide a highly accurate
suite of data for each survey
site and therefore allow the design
of experimental studies of fishing
practices.University of Delaware. Department of Geological Sciences.University of Delaware. School of Marine Science and Policy
Local-scale post-event assessments with GPS and UAV-based quick-response surveys: a pilot case from the Emilia–Romagna (Italy) coast
Get PDFCoastal communities and assets
are exposed to flooding and erosion hazards due to extreme storm events,
which may increase in intensity due to climatological factors in the incoming
future. Coastal managers are tasked with developing risk-management plans
mitigating risk during all phases of the disaster cycle. This necessitates
rapid, time-efficient post-event beach surveys that collect physical data in
the immediate aftermath of an event. Additionally, the inclusion of local
stakeholders in the assessment process via personal interviews captures the
social dimension of the impact of the event. In this study, a local protocol
for post-event assessment, the quick-response protocol, was tested on a pilot
site on the Emilia–Romagna (Italy) coast in the aftermath of an extreme
meteorological event that occurred in February 2015. Physical data were
collected using both real-time kinematic Geographical Positions Systems and
unmanned aerial vehicle platforms. Local stakeholders were interviewed by
collecting qualitative information on their experiences before, during, and
after the event. Data comparisons between local and regional surveys of this
event highlighted higher data resolution and accuracy at the local level,
enabling improved risk assessment for future events of this magnitude. The
local survey methodology, although improvable from different technical
aspects, can be readily integrated into regional surveys for improved data
resolution and accuracy of storm impact assessments on the regional scale to
better inform coastal risk managers during mitigation planning.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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